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          Java 二分查找插入排序
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          二分（折半）插入排序是一种在直接插入排序算法上进行小改动的排序算法。其与直接排序算法最大的区别在于查找插入位置时使用的是二分查找的方式，在速度上有一定提升。
1. 原理解析
总共有N个元素，当插入第i个元素时，对前面的 0~i-1 个元素进行折半，先跟他们中间的那个元素比，如果小，那么再对前半折半 否则对后半进行折半，知道左
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          Java Volatile 关键字
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          Java 语言中的 volatile 关键字可以被看作是一种程度较轻的 synchronized ;跟 synchronized 相比 volatile 使用起来简单方便,编码较少。但是也仅仅只有 synchronized 的部分功能。通过下文,让我们更加理解其意义。合理使用 volatile  关键字,从而减少不必要的系统开销。

    锁提供了两种主要特性： 互斥（mutual exclus
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          ElasticSearch 集群的工作原理
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          说说 Elasticsearch 存储原理,相信有不少人都会关心数据存储在ES中的存储容量。
1. 读写架构
2. 写入过程
    客户端选择一个node发送请求过去,当前node会去找对应的主分片(primary shard) 的 node 如果主分片不在当前节点上,就将请求转发给主分片的 node。
    主分片node在接收到请求document,进行数据写入。然后将数据同步到repli
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          Shell脚本部署jar包
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Linux 下部署 jar的脚本,以及一些采用的设置参数。


1. 目录包&quot;脚本&quot;   &quot;配置&quot;   &quot;包&quot;   &quot;日志&quot;
 bin     conf      lib     logo

&quot;给启动权限&quot;
chmod a+x startup.sh 

&quot;查看端口是否可用&quot;
n
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              2021-06-04
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              <a href="/tags/jar%E9%83%A8%E7%BD%B2/">jar部署</a>
            
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        <a href="/2021/06/04/java/synchronized1.0/" target="_self">
          <img src="/essay/synchronized1.0/img.png" srcset="/img/loading.gif" lazyload alt="深入理解 synchronized 原理">
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          深入理解 synchronized 原理
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        <a href="/2021/06/04/java/synchronized1.0/" target="_self">
          
          
            
          
          Synchronized 是一种JVM锁,大部分人都只是会使用 Synchronized  关键子,在方法上加入 Synchronized  就能对共享变量进行线程安全的使用,确没有了解 Synchronized  大部分真正含义,如,Synchronized  锁的级别,锁的范围(使用不同的对象,锁的范围不同)。希望下文对各位有所帮助。

1. Synchronized使用1.1. 修饰实例方法
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        <a href="/2021/06/04/jvm/jvm3.0/" target="_self">
          Jvm 配置及优化
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      <p class="index-excerpt">
        <a href="/2021/06/04/jvm/jvm3.0/" target="_self">
          
          
            
          
          Java 虚拟机有自己完善的硬件架构, 如处理器、堆栈、寄存器等，还具有相应的指令系统。JVM 屏蔽了与具体操作系统平台相关的信息，使得 Java 程序只需生成在 Java 虚拟机上运行的目标代码 (字节码), 就可以在多种平台上不加修改地运行。JVM是JAVA世界的核心，了解它有助于我们更好调试，调优和开发程序。
1. 命令1.1. 查看 java pid项目jps

1.2. 收集内存使用基本
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          <img src="/essay/HashMap/img_4.png" srcset="/img/loading.gif" lazyload alt="Java HashMap原理以及常见的面试题">
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      <h1 class="index-header">
        
        <a href="/2021/06/04/java/HashMap/" target="_self">
          Java HashMap原理以及常见的面试题
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叙述 HashMap 原理这里以代码为例,本文还回分析一些HashMap在面试中遇到的一些问题以及解答。


1. 先了解几点重要知识1.1. HashMap的组成
    JDK1.7 数组+列表（Entry）分散存储在一个数组。
    JDK1.8 数组+列表+红黑树,（Entry）分散存储在一个数组。JDK1.8中在 HashMap 中引入了红黑树的概念。


1.2. 扩容因子：0.7
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        <a href="/2021/06/04/java/OOM1.0/" target="_self">
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      <h1 class="index-header">
        
        <a href="/2021/06/04/java/OOM1.0/" target="_self">
          Java OOM定位处理
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      </h1>

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        <a href="/2021/06/04/java/OOM1.0/" target="_self">
          
          
            
          
          
本文针对处理 OOM 的定位问题,查询以及解决问题。


1. 常见的几种方式1.1. GC overhead limit exceededJava.lang.OutOfMemeoryError:GC overhead limit exceeded


即程序在垃圾回收上花费了98%的时间，却收集不回2%的空间，通常这样的异常伴随着CPU的冲高。不同的垃圾回收器 OOM 的异常错误不同。


1
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        <a href="/2021/06/04/jvm/jvm2.0/" target="_self">
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      <h1 class="index-header">
        
        <a href="/2021/06/04/jvm/jvm2.0/" target="_self">
          Java 虚拟机 Jvm 内存模型
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        <a href="/2021/06/04/jvm/jvm2.0/" target="_self">
          
          
            
          
          1. 内存模型
2. 主要存放对象实例
3. 程序计数器程序计数器记录当前线程执行程序的位置，改变计数器的值来确定执行的下一条指令，比如循环、分支、方法跳转、异常处理，线程恢复都是依赖程序计数器来完成。
4. 方法区主要存储一些：加载类的信息 、常量、静态变量、即时编译器编译后的代码等元数据信息。
重要区域为常量池: 常量池又分为静态常量池跟运行时常量池。
静态常量池：我们也叫class常量池,存
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              2021-06-04
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        <a href="/2021/06/04/jvm/jvm1.0/" target="_self">
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        <a href="/2021/06/04/jvm/jvm1.0/" target="_self">
          Java 虚拟机 Jvm 堆内存分配
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      <p class="index-excerpt">
        <a href="/2021/06/04/jvm/jvm1.0/" target="_self">
          
          
            
          
          
堆内存是 JVM 一块重点的区域,我们所说的 JVM 调优也是这一块。


1. 内存分配在jdk1.7版本中堆内存被划分为三块：新生代、老年代、持久代。
新生代又主要分为：Eden区（伊甸园）、From Survivor区（幸存区0）、To Survivor区（幸存区1）。JVM默认分配空间为 8:1:1。也就是说Eden的空间分配是最大的。
2. 对象分配
我们新创建的对象实例首先会放在 新
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